Zaoyuan Li

Southwest Petroleum University

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Sheng Huang

Southwest Petroleum University

Donghua Su

Southwest Petroleum University

Xuning Wu

Clausthal University of Technology

Xiaowei Cheng

Southwest Petroleum University

Xiaoyang Guo

Shenyang University of Chemical Technology

Jin Li

Shandong Jiaotong University

Jinfei Sun

Southwest Petroleum University

Kaiqiang Liu

Qingdao National Laboratory for Marine Science and Technology

Xiaowei Cheng

Fudan University

Guo Xiaoyang

China State Construction Engineering (China)

Cooperative Institutions

Southwest Petroleum University

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation

Chinese Academy of Sciences

Sun Yat-sen University

Sichuan University

Clausthal University of Technology

PetroChina Southwest Oil and Gas Field Company (China)

Central South University

Huazhong University of Science and Technology

China National Petroleum Corporation (China)

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Novel Method for Characterizing the Mechanical Properties of the Cement Sheath Based on Hollow-Cylinder Specimen and Multiaxial Load Tests

SPE Journal (2022)

Donghua Su Jin Li Sheng Huang Zaoyuan Li Xuning Wu

Summary Mechanical properties such as Young's modulus, Poisson's ratio, and strength are important parameters for evaluating the cement sheath integrity. However, the current triaxial testing methods for the mechanical properties of intact-cylinder cement specimens ignore the “ring” shape of the wellbore cement sheath and its nonuniform 3D stress distribution, which may lead to deviations from the actual mechanical properties of the wellbore cement sheath that can affect the theoretical analysis results. In this study, we designed a hollow-cylinder cement specimen to address the aforementioned conditions and conducted uni, tri, and multiaxial compression tests to analyze the differences in the deformation, damage, and mechanical failure of the hollow- and intact-cylinder cement specimens. It was found that under the same confining pressure, the Young’s modulus of the hollow-cylinder cement specimen with hole pressure was approximately 1.2 times that of the intact-cylinder cement specimen; however, the difference in Poisson’s ratio was not significant. The uniformity of the radial and circumferential stress distributions in the hollow-cylinder cement specimens was the main factor affecting the volumetric strain curves and the damage threshold. Under tri and multiaxial compression conditions, the deviatoric stress of the hollow-cylinder cement specimens was higher than that of the intact-cylinder cement specimens. Compared with the Mohr-Coulomb criterion, the twin-shear unified strength theory can more accurately reflect the relationships between the radial, circumferential, and axial stresses and the strength of the hollow-cylinder cement specimens. Through a failure test of the cement sheath based on a self-developed wellbore simulation device, it was verified that the mechanical properties of the hollow-cylinder cement specimens can better reflect the failure law of the wellbore cement sheath compared with intact-cylinder cement specimens. The findings of this study can contribute to the understanding of the mechanical behavior of wellbore cement sheaths.

Poisson's ratio

Radial stress

Cylinder stress

10.2118/214293-pa

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Citations (2)

Synthesis of microcrystalline brownmillerite Ca₂(Al,Fe)₂O₅and its influence of mechanical properties to the class G oil-well cement

Journal of Adhesion Science and Technology (2017)

Xiaowei Cheng Yongsheng Yang Yongqiang Yang Kaiqiang Liu Kaiyuan Mei

This study investigated the use of calcium oxide (CaO), aluminum oxide (Al2O3) and ferric oxide (Fe2O3) as raw materials for the production of brownmillerite Ca2(Al,Fe)2O5, after firing at 1330, 1350 and 1370 °C. Lithofacies analysis, SEM/EDS and XRD were used to analyze the phase transition and microstructure of the clinkers during the firing process, and the contents of free calcium oxide (f-CaO) in the clinkers were determined by chemical titration. The results showed that the optimum temperature for the preparation of brownmillerite was 1370 °C (within the selected temperature range). By firing and quenching, microcrystalline brownmillerite (MB) was obtained (crystallinity index was 0.7). Compared with the compressive strength of class G oil-well cement matrix (M0) without MB, the compressive strength of specimens (M4) with 4 wt% MB addition increased by 67, 12, 20 and 33% (after curing for 1, 3, 7 and 14 d, respectively). meanwhile, the elastic modulus of M4 (after curing for 7 d) was reduced by 24% relative to that of M0, indicating that the mechanical properties of M4 were better than that of M0. To investigate the effect of microcrystalline brownmillerite on the strength and toughness of the class G oil-well cement matrix, triaxial testing was used in this study, and the toughening mechanisms were established.

Brownmillerite

Microcrystalline

Alite

10.1080/01694243.2017.1342425

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Citations (8)

Numerical Simulation on the Safety and Quality of Cementing by Using Pad Fluid in Horizontal Wells

Energies (2023)

Ben Qi Jiawen Fu Jinfei Sun Zaoyuan Li Xinqi Yang

The failure of wellbore sealing will cause leakage of greenhouse gases, such as carbon dioxide and methane, which will harm oil and gas recovery and environmental safety. Cementing is an important part of wellbore sealing. Only good cementing can keep the wellbore seal for a long time and improve the well life. In this study, we considered the construction of a horizontal shale oil well in eastern China as the background and analysed the rheological properties of the annulus fluid. We developed a displacement motion model and a calculation model for the annulus dynamic equivalent circulation density, and numerical simulations were used to study the impact of the dosage and injection sequence of the pad fluid on the displacement efficiency and annulus dynamic equivalent circulation density. The results show that when the pad fluid is composed completely of flushing fluid, the displacement performance is better than that of the spacer. By increasing the dosage of the flushing fluid from 0.3 times the annular volume to 1.0 times, the displacement efficiency can be increased by 3.3%, and the retention of the drilling fluid is also reduced by 3.6%. However, it can lead to a significant reduction in the annulus dynamic equivalent circulation density and increase in the risk of leakage. After adding the spacer, the structure of the flushing fluid–spacer provides the optimal injection sequence. Considering the application status in the field example well, it was shown that it can not only ensure the safety of cementing operations, but also improve the displacement efficiency. The results of this study have important theoretical significance and application value and can provide guidance for the optimisation design of the engineering scheme.

Annulus (botany)

Flushing

Lost Circulation

Underbalanced drilling

Wellbore

Leakage (economics)

10.3390/en16093650

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Citations (1)

火成コークス炉における油井セメントの破壊進展に関する研究【JST・京大機械翻訳】

Guisuanyan Tongbao (2016)

Xiaowei Cheng Zhang Mingliang Zaoyuan Li Zhang Xingguo Guo Xiaoyang

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Degradation of high molecular weight polyacrylamide by alkali-activated persulfate: Reactivity and potential application in filter cake removal before cementing

Journal of Petroleum Science and Engineering (2018)

Sheng Huang Xiaoyang Guo Wenhui Duan Xiaowei Cheng Xingguo Zhang

Polyacrylamide

Oxidizing agent

Persulfate

Degradation

10.1016/j.petrol.2018.10.108

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Citations (49)

Influence of potassium titanate whisker on the mechanical properties and microstructure of calcium aluminate cement for in situ combustion

Journal of Adhesion Science and Technology (2017)

Xiaowei Cheng Qingguang Dong Zaoyuan Li Xiaoyang Guo Wenhui Duan

This study investigated potassium titanate whisker-reinforced calcium aluminate cement (CAC)-based composites, and evaluated the influence of the quantity (0–5% of the weight of the binder) of potassium titanate whiskers on the mechanical properties of hardened cement mortar. X-ray diffraction analysis and Scanning electron microscopy (SEM) were employed to determine the phase compositions and micro-morphology of the cement composites, respectively. Experimental results indicated that the addition of potassium titanate whisker exhibits significant potential to improve the tensile strength and toughness of cement mortars. The compressive and tensile strengths of samples cured at 50 °C were increased by 46.90 and 74.10%, and the tensile strength samples under high-temperature treatment increased by 113.67%, with the addition of 4% potassium titanate whisker. Typical cement slurry properties, such as basic rheology, free water, and fluid loss could maintain stability when added with 0–5% dosages of potassium titanate whiskers. SEM analysis indicated that the whisker could increase the toughness of oil cement, which contributed to whisker pullout and whisker-cement coalition pullout in the cement matrix.

Aluminate

10.1080/01694243.2017.1355226

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Citations (12)

Study on Structural Change and Permeability Development Law of Cementing Slurry before Initial Setting in High-Temperature and Deep Well Environment

SPE Journal (2022)

Jun Zhao Youzhi Zheng Lili Cheng Zaoyuan Li Guangyi Zheng

Summary To ensure the safe and efficient development of deep and ultradeep natural gas exploration, it is very important to solve the gas channeling problem of cementing annulus cement slurry in a high-temperature environment. In particular, how to ensure that the cement slurry still has a certain strength, good microstructure, and low permeability in the well are the key points. Based on the current high-temperature and deep well conditions, this paper conducts tests on the microstructure, pore size distribution, and permeability of cement slurry samples with different hydration times. The study found that before the initial setting, the cement slurry gradually changed from a liquid state to a “skeleton-pore” solid medium state, and the permeability of the cement slurry gradually decreased and the rate of decrease gradually accelerated. On the whole, conventional cement slurry has good channeling channel and large permeability before the initial setting. Second, the ability of different antichanneling agents to improve the performance of the cement slurry, the period of action, and the mechanism of action are different. Therefore, to further fully consider its influence on the comprehensive performance of the cement slurry in actual use, it is better to use different antichanneling agents with each other, which can significantly improve the gas channeling resistance and cementing quality of high-temperature cementing slurry system.

Annulus (botany)

10.2118/210570-pa

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Citations (4)

Analysis of interfacial nanostructure and interaction mechanisms between cellulose fibres and calcium silicate hydrates using experimental and molecular dynamics simulation data

Applied Surface Science (2019)

Kaiqiang Liu Xiaowei Cheng Yong Ma Xianshu Gao Chunmei Zhang

Calcium silicate hydrate

10.1016/j.apsusc.2019.144914

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Citations (41)

Influence on Sealing Integrity by Pressurization During Cement Sheath Setting

Volume 10: Petroleum Technology (2022)

Xuning Wu Zaoyuan Li Jian Liu Zhengmeng Hou Donghua Su

Abstract After cement slurry is injected into the a well, weight loss will occur before the cement sheath is formed, so that the pressure of the cement slurry column will gradually decrease, which will increase the risk of micro annulars at the casing-cement sheath-formation interface. In this study, one cement sheath sealing integrity test platform integrated with curing and testing was established to simulate the hydration weight loss process in the cement sheath setting. The sealing integrity of the cement sheath under stage pressurization and rapid depressurization was tested. Using the theory of thick-walled cylinder of an elastoplastic mechanics, the development of the elastoplastic interface of the cement sheath under the change of casing internal pressure was calculated, and the calculation method of equivalent crack width were established. The research results show that, the greater the setting pressure loaded during the curing process on the cement sheath, the higher the stress that the cement sheath can withstand during the later operation. After the cement sheath body is destroyed, as the internal pressure of the casing decreases, the width of the micro cracks increases. The research results of this paper can provide an important reference for designing mechanical properties of cement sheaths and improving the sealing ability of cement sheaths.

Cabin pressurization

10.1115/omae2022-80506

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アルカリ性スラグセメントのアルカリ性に及ぼす珪藻土の影響と機構を研究した。【JST・京大機械翻訳】

Guisuanyan Tongbao (2016)

Guo Xiaoyang Deng Zhizhong Zaoyuan Li Zhou Jingdong Zhang Xingguo

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